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+from typing import List
+
+
+def max_pairs(words: list[str]) -> int:
+ word_set = set(words)
+ count = sum(1 for word in words if word[::-1] in word_set)
+ return count // 2
+
+
+# Tests
+assert max_pairs(["ab", "de", "ed", "bc"]) == 1
+assert max_pairs(["aa", "ba", "cd", "ed"]) == 0
+assert max_pairs(["uv", "qp", "st", "vu", "mn", "pq"]) == 2